One Case, Six Steps, Worked in Front of You

The case — 72-year-old male · Postoperative day 2, open sigmoid colectomy

0700 · Alert, oriented to person, place, and time. Reports incisional pain 5 out of 10, eased to 2 out of 10 after the ordered analgesic. Dressing dry and intact. Temperature 99.2 °F, heart rate 88, blood pressure 132/76 mm Hg, respirations 18. Urine output has run about 55 mL each hour overnight. Admission heart rate baseline 74.

1030 · Newly confused about place; asks the nurse when the ferry leaves. Skin warm and flushed. Heart rate has climbed across three consecutive sets, 88 to 104 to 118. Blood pressure 98/54 mm Hg, lower than every prior reading on the record. Temperature 101.4 °F. Respirations 26.

1145 · Urine output 30 mL across the last two hours, against a prior pattern near 55 mL each hour. Abdomen firmer and more tender than at 0700, with guarding on light palpation. Heart rate 124, blood pressure 90/50 mm Hg **→ BOOK 07 · P5**.

Panel 1 · Recognize Cues Which findings are relevant cues rather than expected findings for this client? Carried forward: new confusion in a previously oriented client; heart rate rising across three consecutive sets from his own baseline; blood pressure below every prior reading; warm, flushed skin; urine output falling below his own established hourly pattern; an abdomen that is firmer and more tender than it was four hours ago. Dropped as expected for the condition: incisional pain that eases with the ordered analgesic on the second postoperative day. Dropped as irrelevant to this question: the intact dressing.

Panel 2 · Analyze Cues Which explanations account for the surviving cues, and which cues support each? Sepsis from an intra-abdominal source: fever, warm flushed skin, rising heart rate, falling blood pressure, altered mental status, falling urine output. Hypovolemia from ongoing loss: rising heart rate, falling blood pressure, falling urine output. Anastomotic leak: the firmer, more tender abdomen with guarding, plus everything sepsis explains, because a leak is a plausible source. Post-operative delirium is named and set aside. It explains the confusion and nothing else, and it does not explain the hemodynamic change at all.

Panel 3 · Prioritize Hypotheses Which hypothesis do we act on first, ranked by cues explained against the cost of being wrong? Sepsis from an intra-abdominal source ranks first, because it is the only explanation that accounts for the warm flushed skin, the mental status change, and the hemodynamics together, and because being wrong about it costs the most and fastest. Anastomotic leak ranks second and is not a competing hypothesis so much as the likely source. Hypovolemia ranks third; it explains three cues and neither the fever nor the flushing.

Panel 4 · Generate Solutions What is defensible to do, and what has to be escalated? Nursing: stay with the client, full vital signs and mental status recheck, oxygen applied, large-bore intravenous access confirmed, strict hourly urine output, nothing by mouth pending a surgical decision. Escalated to the provider: blood cultures before antibiotics, broad-spectrum antibiotics, the ordered crystalloid bolus → BOOK 06, repeat lactate, and imaging. The source-control question is asked out loud: if this is a leak, no amount of fluid fixes it, and someone has to decide about the operating room.

Panel 5 · Take Action What happens first, and why that? First move: escalate now, by rapid response activation and a direct call to the surgeon, because recognition is already complete and every remaining intervention needs an order. While waiting, apply oxygen, confirm access, and position the client. When antibiotics arrive, blood cultures are drawn first if drawing them does not delay the antibiotic, because a culture taken after the first dose may never name the organism.

Panel 6 · Evaluate Outcomes Which client parameters must change, by when, and what sends us back? Vital signs every 15 minutes until stable. Mean arterial pressure at or above the ordered target → BOOK 06. Urine output back to at least 0.5 mL per kilogram each hour. Mental status returning toward his own baseline. Repeat lactate falling on the next draw. The reopening sentence: if blood pressure responds to fluid but the abdomen keeps firming and the pain climbs, the case goes back to Panel 2, because source control is a surgical answer and fluid was never going to supply it.

Watch outRanking is where this case is won or lost. A candidate who stops at hypovolemia treats the numbers, gives fluid, watches the pressure improve for an hour, and misses the source entirely.

Margin notedelirium explains the confusion. Nothing else.

Ranking frameworks this page deliberately does not teach → BOOK 03 · P4. Sepsis pathophysiology as a subject → BOOK 09 · P7.

TakeawayA case is worked by carrying one shrinking set forward through six named steps, and every discard is a decision you can point to.